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Daniel G. Aliaga

Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: \\arthur.cs.purdue.edu\aliaga\.www\pics\CGVlocomotive-sm.gif

Associate Professor of Computer Science

Purdue University

305 N. University St.

West Lafayette, IN 47907-2066

FAX: (765) 494-0739

Email: aliaga at cs purdue edu

 

Short Biography: Dr. Daniel G. Aliaga’s research is primarily in the area of 3D computer graphics but overlaps with computer vision and with visualization. He focuses on i) 3D urban modeling (creating novel 3D urban acquisition algorithms, forward and inverse procedural modeling, and integration with urban design and planning), ii) projector-camera systems (focusing on algorithms for spatially-augmented reality and for appearance editing of arbitrarily shaped and colored objects), and iii) 3D digital fabrication (creating novel methods for digital manufacturing that embed into a physical object information for genuinity detection, tamper detection, and multiple appearance generation). Dr. Aliaga has also performed research in 3D reconstruction, image-based rendering, rendering acceleration, and camera design and calibration. To date Prof. Aliaga has published over 90 peer reviewed publications and chaired and served on numerous ACM and IEEE conference and workshop committees, including being a member of more than 40 program committees, conference chair, papers chair, invited speaker, and invited panelist. In addition, Dr. Aliaga has served on several NSF panels, is on the editorial board of Computer Graphics Forum and of Graphical Models, and is a member of ACM SIGGRAPH. His research has been whole or partially funded by NSF, MTC, Microsoft Research, Google, and Adobe Inc.

 

Curriculum Vitae (CV)

 

Academic Positions

o   Associate Professor, Purdue University, 2010-present.

o   Visiting Professor in Computer Vision and Geometry Group, Department of Computer Science, ETH Zurich, 2011.

o   Visiting Professor in Chair for Information Architecture, Department of Architecture, ETH Zurich, 2011.

o   Assistant Professor, Purdue University, 2003-2010.

o   Research Staff, Princeton University, 2003.

o   Member of Technical Staff, Bell Labs, 1999-2002.

o   Ph.D., Computer Science, University of North Carolina at Chapel Hill, 1993-1999.

o   M.S., Computer Science, University of North Carolina at Chapel Hill, 1991-1993.

o   B.S. Computer Science, Magna Cum Laude, Honors, Brown University, 1987-1991.

o   High School, Colegio Santa Maria, Lima - Peru, 1982-1986.

 

Research 

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Urban Modeling and Visualization

 

Our objective is to capture, simulate, and modify models of urban environments. Today, more than half of the world’s population of 7 billion people lives in cities – and that number is only expected to grow over the next 30 years. Cities, and urban spaces of all sizes, are however extremely complex and their modeling is still not solved. We pursue multi-disciplinary research focused on visual computing tools for improving the complex urban ecosystem and for “what-if” exploration of sustainable urban designs, including integrating urban 3D modeling, simulation, visualization, meteorology, and vegetation modeling. To date, we have developed several algorithms and large-scale software systems using ground-level imagery, aerial imagery, GIS data, and forward and inverse procedural modeling to create/modify 3D and 2D urban models.

 

č See documentary (2010), “Man-made Disasters” by National Geographic Documentary as part of NatGeo Naked Science series, appeared together with Prof. Dev Niyogi on topic of urban sprawl and urban heat islands.

 

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Appearance Editing: Modifying the Appearance of Real-World Objects

Appearance editing offers a unique way to view visually altered objects with various appearances or visualizations. By carefully controlling how an object is illuminated using digital projectors, we obtain stereoscopic imagery for any number of observers with everything visible to the naked eye (i.e., no need for head-mounts or goggles). Such ability is useful for various applications, including scientific visualization, virtual restoration of cultural heritage, and display systems.

 

č See blog (2011), “Digital Restoration: Introducing an Undo Function” by Central Science (C&EN).

č See newscast (2009), “Restoring Art in an Instant” by Discovery Breakthroughs in Science (DBIS).

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Embedding Information into Physical Objects

 

We seek to provide methods to embed into a physical object information for a variety of purposes, including genuinity detection, tamper detection, and multiple appearance generation. Genuinity detection refers to encoding fragile or robust signatures so that a copy, or tampered, version can be differentiated from the original object. Multiple appearance generation refers to generalizing the encoded information from a signature to a different appearance of the same physical object. The project also includes the development of underlying infrastructure for 3D model acquisition and for appearance/signature creation and extraction using projector-based illumination.

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A Photogeometric Framework for Capturing 3D Objects

We introduce a photogeometric framework for acquiring 3D objects with sub-millimeter accuracy. The defining characteristic of our framework is leveraging the complementary advantages of photometric and geometric acquisition. The two approaches are tightly integrated in an iterative acquisition process that achieves self-calibration, multi-viewpoint sampling, and high level of detail.

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Pose-free 3D Reconstruction

 

Conventional 3D reconstruction from digital photographs requires (pre-calibration) or computes (self-calibration) camera pose for each photograph. We have developed a mathematical framework where the parameters defining camera poses are eliminated from the nonlinear system of 3-D reconstruction equations, which leads to significantly more robust and accurate 3D models.

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Modeling Scenes with Strong Inter-reflections

Structured light is a powerful approach for acquiring 3-D models of real world scenes. The scene is illuminated with a custom pattern of light and imaged with a digital camera. An important challenge in structured light acquisition comes from glossy and specular objects which reflect the patterns of light and create false positives. We have developed an iterative and adaptive algorithm that reduces the inter-reflection within the scene, which leads to robust pixel classification and to accurate and dense 3-D reconstruction.

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Modeling Repetitive Motion in Real-World 3D Scenes

 

Most 3-D acquisition systems assume that the scene is static. We have taken significant steps towards supporting the acquisition of dynamic scenes by developing algorithms that detect and leverage repetitive motion in the scene (e.g. person walking, flag waving). Our approach produces space-time 3D models using as few as two cameras or one camera-projector pair.

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Occlusion-Resistant Camera Designs: Acquiring Active Environments

 

Obtaining image sequences of popular and active environments is often hindered by unwanted interfering occluders. In this work, we propose a family of Occlusion-Resistant Camera designs for acquiring such environments. Our cameras explicitly remove interfering occluders from acquired data in real-time, during live capture.

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Sea of Images

 

We present an image-based approach to providing interactive and photorealistic walkthroughs of complex indoor environments. Our strategy is to obtain a dense sampling of viewpoints in a large static environment with omnidirectional images and to replace the 3D reconstruction challenges with easier problems of motorized-cart control, dense image-based sampling, and compression.

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Mixed Reality and Tablet PCs

 

The project investigates several graphical and educational tools using Tablet PCs. We have developed hardware and software tools for tabletop mixed-reality and for Tablet PC applications in classrooms.

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Massive Modeling Rendering

 

A key component of providing realism is rendering large and detailed 3D models at high frame rates. We explore various rendering acceleration methods, including visibility culling, geometry simplification, and image-based rendering.

 

Diversity

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Publications

Selected recent publications:

·       Automatic Urban Modeling using Volumetric Reconstruction with Surface Graph Cuts, I. Garcia-Dorado, I. Demir, D. Aliaga. Computers & Graphics, 37, 896-910, 2013.

·       Automatic Modeling of Planar-Hinged Buildings, I. Garcia-Dorado, D. Aliaga. Proceedings of Eurographics, short paper, 4 pages, 2013.

·       A Survey of Urban Reconstruction, P. Musialski, P. Wonka, D. Aliaga, M. Wimmer, L. van Gool, W. Purgathofer. Computer Graphics Forum (CGF), also Eurographics STAR, 27 pages, 2013.

·       Evaluation of Shape Grammar Rules for Urban Transport Network Design, B. Vitins, I. Garcia-Dorado, C. Vanegas, D. Aliaga, K. Axhausen. Proceedings of Transportation Research Board, 19 pages, 2013.

·       Inverse Design of Urban Procedural Models, C. Vanegas, I. Garcia-Dorado, D. Aliaga, B. Benes, P. Waddell. ACM Transactions on Graphics (TOG), also SIGGRAPH Asia, 11 pages, 2012.

All publications:

Bevel: Conferences Papers

Bevel: Journal Articles

Bevel: Dissertation/Theses

Bevel: Patents

 

Courses

Current course: Spring 2014 – CS434

 

Number

Title

Year

 CS590G/CS635

 Capturing, Modeling, Rendering 3D Structures

 Fall 2003, Fall 2004, Spring 2007, Spring 2009, Spring 2010

 CS590M

 Geometric Modeling and Applications

 Spring 2004

 CS535

 Interactive Computer Graphics

 Fall 2005, Fall 2007, Fall 2010, Fall 2012

 CS530

 Introduction to Scientific Visualization

 Fall 2009

 CS490G

 Tablet PC Graphics

 Spring 2004, Spring 2005, Spring 2006

CS434

 Advanced Computer Graphics

 Spring 2013, Spring 2014

 CS397/CS497

 Honor's Research

 Fall 2004

 CS334

 Fundamentals of Computer Graphics

 Spring 2008, Fall 2008, Spring 2012, Fall 2013

 CS251

 Data Structures

 Fall 2006, Spring 2013

 CS197

 Freshman Honor’s Seminar

 Spring 2010

 

Students

Graduate:

Advisee’s

Ignacio Garcia-Dorado (CS, PhD student)

Ilke Demir (CS, PhD student)

Feng Meng (CS, PhD student)

Gen Nishida (CS, PhD student)

Carlos Vanegas (CS, PhD 2012, went to Postdoc @ UC Berkeley and Synthicity)

Alvin Law (CS, PhD 2011, went to Google)      

Yi Xu (CS, PhD 2010, went to GE Research)

Daniel Bekins (CS, MS 2005, went to Electronic Arts)

Scott Yost (CS, MS 2004, went to Microsoft)

Committee member:

Paul Schmid (EAS, PhD student)

Paul Rosen (CS, PhD 2010, went to Research Asst Prof @ University of Utah)

Mihai Mudure (CS, PhD 2008, went to Google)

Huiying Xu (CS, PhD 2007, went to Cisco)

David Gotz (CS, PhD 2005, UNC, went to IBM Research)

 

Undergraduate:

Ben Staiger (CS, BS 2017)

David Fifer (CS, BS 2013)

Yeong-Ouk Kim (CS, BS 2012)

John McCoy Crofts (CS, BS 2012)

Andy Feldkamp (CGT, BS 2011)

Tyler Smith (CS, BS 2011)

Philip Jarvis (CS, BS 2011)

Aaron Link (CS, BS 2009)

Robert Insley (CS, BS 2008)

Dat Nyugen, Nitin Nalreja, Nimesh Amin (CS, BS 2006)

Paul Ardis (CS, BS 2005, now at Univ. Rochester)

Jamie Gennis (CS, BS 2005, now at NVIDIA)

Jonathan Deutsch (CS, BS 2005, now at Apple Corp)

Darin Rajan (CS, BS 2005)

 

Research Funding

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF IIS, (Purdue PI): A Heterogeneous Inference Framework for 3D Modeling and Rendering of Sites, 2013-2016.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF CBET, (PI) “STRONG Cities – Simulation Technologies for the Realization of Next Generation Cities”, 2012-2015.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF IIS, (PI) “Integrating Behavioral, Geometrical and Graphical Modeling to Simulate and Visualize Urban Areas”, 2010-2014.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: C:\Users\aliaga\Desktop\google.jpg  Google Research Award, (PI) “Modeling of Buildings from Photographs”, 2011-present.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: C:\Users\aliaga\Desktop\mtc.jpg   Metropolitan Transportation Commission, (Purdue PI) “Urban Simulation Visualization”, 2011-2013.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF CNS, (PI) “A Computational Framework for Marking Physical Objects against Counterfeiting and Tampering”, 2009-2013.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF OCI, “INTEROP: Developing Community-based Drought Information Network Protocols and Tools for Multidisciplinary Regional Scale Applications (DRInet)”, 2008-2013.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: iarp Purdue-IUPUI Applied Research Grant, (PI) “Digital Inspection and Virtual Restoration of 3D Objects”, 2008-2009.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: adobe-lq Adobe Inc., (Co-PI) “Vector Pattern Modeling and Editing“, 2008-present.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: pace PACE/Hewlett-Packard Hardware Grant, (PI) 2008.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF REU, (PI) “3D Scene Digitization”, 2006-2008.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: nsf NSF MSPA-MCS, (PI) “3D Scene Digitization: A Novel Invariant Approach for Large-Scale Environment Capture”, 2004-2008.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: logo_msr Microsoft Research, (PI) “PMR: Portable Mixed Reality”, 2005-present.

o   Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: logo_msr Microsoft Research, (PI) “MRT: A Mixed Reality Tabletop”, 2004-present.

 

Recent Professional Activities (last ~2 years)

o   Discovery Park Faculty Research Fellow (2013-2014)

o   Purdue University Diversity Award (2012)

o   OECD Fellowship Recipient (2011)

 

o   “Designing and Modeling Intelligent Cities”, Invited Talk, Universidad de Ingenieria y Tecnologia, Lima, Peru, July, 2013.

o   “Cities of Tomorrow: Visual Computing for Sustainable Urban Ecosystems”, Invited Talk, National Institute of Informatics, Tokyo, Japan, July 2013.

o   “Cities of Tomorrow: Visual Computing for Sustainable Urban Ecosystems”, Invited Talk, Networks and Complex Systems at IU Bloomington, Cyberinfrastructure for Network Science Center, April, 2013.

o    “Appearance Editing: What you see is not what you have”, Invited Talk, 3rd Annual SIGGRAPH Chapter Conference, Bogota, Colombia, October, 2012.

o   “Appearance Editing”, Invited Talk, UMIACS, Univ. of Maryland at College Park, July 2012.

o   “Cities of Tomorrow: Visual Computing for Designing Sustainable Urban Ecosystems”, Keynote, National Socio-Environmental Synthesis Center (SESYNC) Workshop: Visualization Technologies to Support Research on Human-Environmental Interactions, July, 2012.

o   “Appearance Editing”, Invited Talk, ETH Computer Science/Disney Research Lab, Zurich, Switzerland, November, 2011.

o   “Future City Systems”, Invited Panel Member and Presenter, Asia-Pacific Conference on Systems Engineering (APCOSE): Green Growth and Systems Engineering, October, 2011.

o   “Computational Cities: Geometrical Modeling for Urban Design and Simulation”, Invited Talk, Center for Image Analysis, Uppsala University, Sweden, September, 2011.

o   “Computational Cities: Geometrical Modeling for Urban Design and Simulation”, Invited Talk, Department of Urban Systems Engineering, Technical University of Compiegne, Compiegne, France, June, 2011.

o   “Computational Cities: Geometrical Modeling for Urban Design and Simulation”, Invited Talk, Qatar Energy and Environment Institute and Qatar Computing Research Institute, Qatar Foundation, Doha, Qatar, April, 2011.

o   “3D Urban Modeling and Simulation”, Guest Lecture, Chair of Information Architecture, ETH, Zurich, Switzerland, April, 2011.

o   “Computational Cities: Geometrical Modeling for Urban Design and Simulation”, Guest Lecture, Chair of Computer Aided Architectural Design, ETH, Zurich, Switzerland, March, 2011.

o   “Computational Cities: Geometrical Modeling for Urban Design and Simulation”, Colloquium Talk, Department of Informatics, University of Zurich, Zurich, Switzerland, March, 2011.

 

o   International Program Committee for Eurographics 2014

o   Technical Briefs and Posters Committee for ACM SIGGRAPH Asia 2013

o   Program Committee for IEEE ICCV 2013

o   Program Committee for IEEE Visualization 2013

o   Program Committee for 3DV 2013

o   Program Committee for IEEE CVPR 2012

o   Program Committee for 3DPVT 2012

o   Program Committee for ECCV 2012

o   Program Committee for IEEE PROCAMS 2012

o   Conference Committee for Int’l Conference on Computing for Geospatial Research & Applications 2012

o   Program Committee for ACM Symposium in Interactive 3D Graphics 2012

o   Program Committee for ICVGIP 2012

o   Program Committee for IEEE Visualization 2011

o   Program Committee for IEEE ICCV 2011

o   Program Committee for IEEE CVPR 2011

o   Conference Committee for Int’l Conference on Computing for Geospatial Research & Applications 2011

o   Program Committee for ACM Symposium in Interactive 3D Graphics 2011

 

Personal

o   Hobbies: vintage computers, woodworking, model trains, martial arts, soccer, mountain biking

o   Languages: English, Spanish, some German

o   Family, Wedding, some videos